For the first time ever, the rare decay of a Bs meson into two muons has been observed. For every billion times the decay goes the other way, it goes this way just three times. This result rules out some of the simplest supersymmetry models, meaning scientists might need to start looking for alternative explanations for dark matter and the fundamental structure of the universe.

A fish-eating sea sponge is discovered. It’s not the first sponge discovered to do this, but it was observed in action with unprecedented detail. The link will take you to a video of it.